You shouldn't have to do anything aside from double click. You have to make sure you have the Java runtime environment installed. Also verify that the the files extension is for sure a JAR. If you followed the directions in the above link it should walk you through the process.

‎"The greatest of all weaknesses is the fear of appearing weak." - JB Bossuet

I'm at a loss to understand what you're looking for. Darryl pointed you to a writeup that contains the answer you're looking for. You seem to have overlooked that, so I pointed out that, yes, indeed, the answer is in there. I thought for sure you would now read it more carefully. Instead, you're repeating essentially the same question a third time; may be you can apply yourself a bit harder?